Executive brief
Silverstripe versioned is a content versioning system for the Silverstripe CMS platform. The archive admin restore feature allows administrators to restore previously archived pages, but fails to properly sanitize page titles before displaying them, allowing attackers to inject malicious JavaScript code. An attacker who can create or modify a page title could execute arbitrary actions in an administrator's browser when they attempt to restore that page, potentially leading to account compromise or data manipulation.
Technical details
The vulnerability is a cross-site scripting (XSS) flaw in the RestoreAction message handler within Silverstripe versioned. The root cause is insufficient input sanitization of page titles when rendering restoration confirmation messages in the ArchiveAdmin interface. The attack vector is network-based and requires user interaction—specifically, an administrator must initiate a page restore operation. The vulnerability allows an attacker to execute arbitrary JavaScript within the security context of the administrator's authenticated session, with potential impacts including session hijacking, unauthorized actions, or data exfiltration. The issue was patched in version 3.2.1, released on June 24, 2026.
Affected products
- Silverstripe Ltd. versioned < 3.2.1
Timeline
- 2026-06-24: disclosed: Vulnerability published to GitHub Advisory Database
- 2026-06-24: patched: Version 3.2.1 released with fix
References
- https://github.com/silverstripe/silverstripe-versioned/security/advisories/GHSA-m4g4-86qc-v8w7
- https://github.com/silverstripe/silverstripe-versioned/pull/541
- https://github.com/silverstripe/silverstripe-versioned/commit/6e30a2cf8d4b9233690464da61bd0fc4d3e92952
- https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/versioned/CVE-2026-55779.yaml
- https://github.com/silverstripe/silverstripe-versioned/releases/tag/3.2.1
- https://www.silverstripe.org/download/security-releases/cve-2026-55779